adding crc and parity crap

lib/nfc.rb

@@ -1,15 +1,31 @@
+require 'singleton'
 require 'nfc/lib_nfc'
 
 class NFC
   VERSION = '1.0.0'
 
   attr_reader :device
 
+  include Singleton
+
   def initialize
-    @device = nil
+    @device = NFC::LibNFC::Device.new(NFC::LibNFC.nfc_connect)
+    LibNFC.nfc_reader_init(@device.pointer)
   end
 
-  def connect
-    @device = NFC::LibNFC::Device.new(NFC::LibNFC.nfc_connect)
+  def deactivate_field
+    LibNFC.nfc_configure @device.pointer, LibNFC::DCO_ACTIVATE_FIELD, 0
+  end
+
+  def activate_field
+    LibNFC.nfc_configure @device.pointer, LibNFC::DCO_ACTIVATE_FIELD, 1
+  end
+
+  def crc= value
+    LibNFC.nfc_configure @device.pointer, LibNFC::DCO_HANDLE_CRC, value ? 1 : 0
+  end
+
+  def parity= v
+    LibNFC.nfc_configure @device.pointer, LibNFC::DCO_HANDLE_PARITY, v ? 1 : 0
   end
 end

lib/nfc/lib_nfc.rb

@@ -7,6 +7,12 @@ class LibNFC # :nodoc
 
     attach_function :nfc_connect, [], :pointer
     attach_function :nfc_disconnect, [:pointer], :void
+    attach_function :nfc_reader_init, [:pointer], :int
+    attach_function :nfc_configure, [:pointer, :int, :int], :int
+
+    DCO_HANDLE_CRC      = 0x00
+    DCO_HANDLE_PARITY   = 0x01
+    DCO_ACTIVATE_FIELD  = 0x10
 
     class Device < FFI::Struct
       layout(:name, [:char, 256])

test/test_nfc.rb

@@ -2,10 +2,29 @@
 require "nfc"
 
 class TestNFC < Test::Unit::TestCase
+  def setup
+    @nfc = NFC.instance
+  end
+
   def test_connect
-    nfc = NFC.new
-    assert_nil nfc.device
-    nfc.connect
-    assert_not_nil nfc.device
+    assert_not_nil @nfc.device
+  end
+
+  def test_deactivate_field
+    @nfc.deactivate_field
+  end
+
+  def test_activate_field
+    @nfc.activate_field
+  end
+
+  def test_crc=
+    @nfc.crc = true
+    @nfc.crc = false
+  end
+
+  def test_parity=
+    @nfc.parity = true
+    @nfc.parity = false
   end
 end